Portable rubbing machine



March 18, 1924.` 1,487,398 R. A. M ooRE PORTABLE RUBBING MACHINE Filed April l1, 1918 l 2 Sheets-Sheet l l J/VEA/Tor/ iff; robert/7, Moy

TTO KJVEY I M. w w M Q a w Z@ .......f:.........../

March 18', 1924:

Patented 18, '1924.

ROBERT A. MOORE, 0F DETROIT, MICHIGAN.

PGRTBLE RUBBING MACHINE.

Application filed April 11, 1918. Serial No. 228,018.

To all whom it .my concern:

Be it known that I, ROBERT A. MOORE, a citizen of the United States, and a resident of Detroit, county of Wayne, and State of Michigan, have invented a new ,and useful Improvement in Portable Rubbing Maw ated by a single workman for rub ing down' or smoothing painted or varnished surfaces preliminary to the application of the finishing coats. lhis work is usually done by hand and requires a considerable time, which it is one of the objects of thisinvention to save by providing a simple and convenient machine which may be operated by a single workman. Other objects of the inventions are the provision ofmcans for supplying a uniform amountof rubbing material to the surface to be worked upon and convenient manual control of the device by the operator. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter full described and particularly pointed out 1n the f moved to show the mechanism;l"ig. 2 is an terial; Fig. 4 is a section on linee-4f,

end view of the device looking at the same from the right side of Fig. 1 and from inside the casing; Fig. 3 is a side elevation oi the device connected with the supply reservoirs for fluid pressure and surfacing lip a- 1g. 1; Eigs. 5, 6 and 7 are plan views of rubbing belts showing the various types of recesses formed therein for receiving surfacing material, and Fig. 8 is a section on the line 88, F ig. 3. ln F ig. 3 the rubbing device 1 is shown connected to two dexible conduits 2 and 3 of which the former is-connected to a' conduit 4 for supplying suitable fluid pressure, such as compressed air. or steam, to the device for operating the motor whichwill' presently be described, while the conduit 3 is connected to a suitable supply reservoir 5 for rubbing or surfacing material suspended in water, such, for example, as pumice stone. the line 2 extends to the bottom of the reservoir 5 and supplies a small amount of fluid pressure thereto at all times for the A. connection 6 from purpose of agitating the rubbing material in water and maintaining the proper amount of material in the water which is fed through the line 3, the fluid pressure being discharged into the reservoirs through a' distributor 40 having nozzles 41 arranged to impart a circular movement to the liquid and solid matter in the reservoir.

rllhe device itself is best Shown in Fig. 1 and consists of a casing or frame 7 in which is housed a suitable fluid pressure motor8, which may be of any suitable type 'and which need not be described in detail.

from the conduit 2 and the exhaust discharged laterally `through the sides of the casing7 through the apertures 9, which are indicated in this ligure. Mounted in the casing 7 are a plurality of pulleys or rollers A 10 and 11, there being a number of the pulleys 11 which are preferably arranged in The. uid preure motor 8 receives fluid pressure the same plane and serve as a support for a e portion of a rubbing belt 12, which passes over all the pulleys. rlhe pulleys llvare preferably constructed in such a manner as to yield axially in the manner described in my co-pending application, Serial No. 209,756, filed December 31, 1917 and since the construction of these pulleys forms no part of the present invention, I have not shown-in detail their construction. The pulley 10 is provided with a number of points or teeth 13 which are adapted to engage in suitable formed apertures on the inner side of the belt 12 and in this way positively drives this belt. I have yfound it preferable to drive Y beltp18, preferably formed ofsome material like cork and provided with a number, of transverse slits 19A which permit the belt to conform to the surface of the rollers 11l at the ends of the line ot these rollers. This belt 18 does not pass over the pulley 10 but `merely serves as a support for the belt 12,

while the latter passes across the rollers 11. Thepulleys 10 and 11 are mounted on a suitable triangular frame work 20, which is y provided on either side `with guidesi21 enbelts are removed from the casing, the beltA gaging in guideways22 formed in the sides of the casing 7 in the manner shown in Fig. 4. The bottom of the casing 7 is open and the frame 20 with the pulleys and belts may be inserted into this open end and locked therein by means of keys or latches 23. The position of this latch determines the inner position of the framework 20, and this position will be such that, as the framework` is moved into the casing, the belt 12 engages against the idler 17 and is tensioned only when inserted in the casing in operative position. When the framework and 12 is relatively loose and may be readily removed lrom the pulleys tor replacement or repairs.

Ilhe conduit 3 slipplyingsurfaciiig ,ma

terial terminates in a nozzle 25 extending transversely across the upper end oi the belt l12 at the point where the latter passes over the pulley 10. The belt makes a very sharp angle in passing over the relatively small pulley 10 so that the belt is bent sharply and this bending opens up slots 26 which; are formed in the outer surface of the belt. These slots may be of dierent forms, as indicatedrin Figs. 5, 6 and 7, although l have found that a satisfactory form of these slots or recesses is that in which the slots run diagonally across each other, which` form is shown in Fig. 5. The Water and pumice stone or other surfacing material is fed into these open slots and the action of the beltin closing the slots after each por-4 tion leaves the pulley 10 .squeezes out the water and retains the pumice stonein theseY recesses on the belt. In this way the surface of the belt is always supplied with a surfacing material and an even and regular action on the painted or varnished surface is secured.

3 respectively at the points adjacent to the top of the casing 7, in this way varying the speed of the rubbing and also the amount of rubbing3 material to suit the nature of the Work.

The uses to which the present apparatus may be applied are numerous and far more extensive thanithe single illustrative field here referred to, i. e. the rubbing of, painted and varnished surfaces, and these other uses will readily suggest themselves to those skilled in the various arts. Similarly other materials may be supplied to the belt depending upon the particular surface to be treated and the Work to be done thereon.

@ther modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent ci such stated means be employed.

li therefore particularly point out and distinctly claim as my invention 1. ln a portable hand rubbing machine of the character described, the combination of a frame, a belt and a motor for driving the same operatively mounted thereon, said belt being provided with a plurality of normally closed slots adapted to be opened in their travel through the machine and adapted to receive surfacing material therein lwhen opened, and means adapted to feed surfacing material to such slots in said belt.

2. 1n a machine of the character described, the combinationof a trame, a belt operatively mounted thereon, said belt being provided with a plurality of normally closed slots adapted to receive surfacing material therein, said belt beingv arranged to pass over a relatively small pulley to thereby open such slots, and means adapted to feed surfacing material to such slots when open.

3. ln a portable hand rubbing machine of the character described, the combination of a frame, a plurality of pulleys mounted therein, a belt passing over all of said pulleys, a second pulley spaced from said first named pulleys, a second belt contacting said first named belt and supporting it against its pulleys and passing over said second pulley, and adapted to drive said second belt and through it said first named belt, and a motor mounted on said frame for driving said secondbelt.

4. ln a portable hand rubbing machine of the character described, the combination of a frame, a plurality `of spaced pulleys u l mountedl therein, a belt passing ovet all ing provided with interengaging means ulleys, o second pulley mounted on said adapted to constitute a positive driving graine and; spaced. from said first named connection between said belt an said pulle o 10 pulleys, a, second ibelt contacting said; first Signed by me this 16th day of More 5 named belt and supporting it against itsv 1918.

pulleys sind passing over said second pulley,

said second belt and said second pulley be- ROBERT A. MOGRE. 

